Navigate to the Datadog Agent configuration directory.

# cd /etc/dd-agent/conf.d

Create a ceph.yaml file from the ceph.yml.sample file.

# cp ceph.yaml.example ceph.yaml

Modify the ceph.yaml file.

# vim ceph.yaml

It will look like this:

init_config:

instances:
#  - tags:
#    - name:mars_cluster
#
#    ceph_cmd: /usr/bin/ceph
#    ceph_cluster: ceph
#
# If your environment requires sudo, please add a line like:
#          dd-agent ALL=(ALL) NOPASSWD:/usr/bin/ceph
# to your sudoers file, and uncomment the below option.
#
#    use_sudo: True

Uncomment the -tags, -name, ceph_command and ceph_cluster lines. The default values for ceph_command and ceph_cluster are /usr/bin/ceph and ceph respectively. For RHEL 7, uncomment use_sudo: True; however, this step is optional for Ubuntu, since Ubuntu disables the root user and gives the initial admin user root permissions.

When complete, it will look like this:

init_config:

instances:
  - tags:
    - name:ceph-RHEL
#
    ceph_cmd: /usr/bin/ceph
    ceph_cluster: ceph
#
# If your environment requires sudo, please add a line like:
#          dd-agent ALL=(ALL) NOPASSWD:/usr/bin/ceph
# to your sudoers file, and uncomment the below option.
#
    use_sudo: True

For RHEL 7, modify the sudoers file.

# visudo

Add the following line.

dd-agent ALL=(ALL) NOPASSWD:/usr/bin/ceph

Enable the Datadog agent so that it will restart if the Ceph host reboots.

# systemctl enable datadog-agent